I think that a man should not live beyond the age when he begins to deteriorate, when the flame that lighted the brightest moment of his life has weakened.

... If Mr. Kennedy does not like Socialism, we do not like imperialism. We do not like Capitalism.

We are not politicians. We made our revolution to get the politicians out.

Ideas do not need weapons.

The percentage of mentally disturbed people in the United States is very high. From the time the American gets up in the morning, he feels as if someone is trying to influence his will in some way: he is a person with a thousand pressures. The Americans live under a great strain ... and have great feelings of frustration.

Nowhere in the world, in no act of genocide, in no war, are so many people killed per minute, per hour and per day as those who are killed by hunger and poverty on our planet.

I do not conceive of any manifestation of culture, of science, of art, as purposes in themselves. I think the purpose of science and culture is man.